Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27e1069cece29d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 02:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d878e0a83bf9b544ae184fea05d0582 SHA-1: 2db0d0300409c1fbb167ee6e234d317795d192ac SHA-256: da27e1069cece29d468b5415bcf3f902a98e3bdd7d3936792b151393799241bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=tau+empire+8th+edition+codex+pdf PDF link annotation
    • https://areopag.ru/sites/default/files/uploads/jomupigogatara.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/jerebewuna.pdfIn PDF document text
    • http://lblussana.it/images/file/lavetubibopebafaforet.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/44006133157.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/dojamujazowevoza.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/1129814773.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/ripimigogivadi.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/41047426241.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/18818400131.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sk9olngr4dgjn4pj2ikfl6gdvs/wawese.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/vomekasozugaw.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/negekazo.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/19722193185.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/88577378856.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/80125921206.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/nekawakesajeminagilotalob.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/zasisaninidagob.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109030756343603.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/boperofalonozu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613291cb4d806---174502380.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/jawuvapid.pdfIn PDF document text
    • http://www.centralperdana.com/file/20030853254.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/fuzol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 11044 bytes
SHA-256: 55c1b6f9644d7f5f1d02c187bf0025951ec24fcaf0de445ea45dd4124191fa3a
font_02_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 17564 bytes
SHA-256: 9cb57b412276f66b7b204bec8ed5a324c7b8d34e9ee27a8a1434d74a34220421

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